Geoscience Reference
In-Depth Information
STI
250
200
PRO
150
100
TST
A
50
B
C
0
D
50
E
−
−
100
F
−
150
G*
G
−
200
−
16500
−
16000
−
15500
−
15000
−
14500
−
14000
−
13500
DISTANCE (m)
Fig. 5.2. 2D N-Scross-sectionat thecentre of the valley. AtoG represents
different soil and rock (G)categories
Fig. 5.3. Map withthe surface accelerographs (green rectangles)
and thegeologic background
Geological conditions.
Numerous surveys on geology, geomorphology, tectonic, seis-
micity, water and aquifer level as well as geotechnical and geophysical surveys, GPS
geodetic monitoring, etc., have been performed during the last 40 years. In the last 15
years (since the beginning of the project in 1993) a series of well oriented geotechnical
and geophysical studies have contributed to the knowledge of the 3D complex structure
of the basin.
The geology is composed of two main sedimentary geologic systems and the crystalline
basement. The sedimentary units, Mygdonian and Promygdonian are differentiated by
